many palestinians believe he was poisoned by israel. that something israel denies. the bottom line here in life he was controversial and in death, bill, he also remains very controversial. bill: what is this pallonium poison? >> it is a radioactive element that can be extremely, extremely deadly. according to u.s. regulatory, nuclear regulatory commission it emits radiation that can essentially destroy human tissue. it can not we are told penetrate skin. if ingested it can cause deadly harm to dna, to main body organs and as well as we are told the immune system. and this particular isotope is so powerful, bill, that we're told that an amount as small as the size of a grain of salt can be deadly. another thing to keep in mind is that it decays very, very quickly. it has a very short half-life. in other words, officials say, after 2 1/2 years it might be very hard to detect. that means after arafat has been buried since 2004, whatever results are reached might in fact be inconclusive. bill? bill: david lee miller, a good mystery you have from jerusalem. thank you, da